/*
 * Copyright 1999-2017 Alibaba Group Holding Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package wang.yeting.sql.ast.statement;

import wang.yeting.sql.ast.*;
import wang.yeting.sql.visitor.SQLASTVisitor;

import java.util.ArrayList;
import java.util.List;

/**
 * @author zz [455910092@qq.com]
 */
public class SQLWhileStatement extends SQLStatementImpl implements SQLReplaceable {

    //while expr
    private SQLExpr condition;
    private List<SQLStatement> statements = new ArrayList<SQLStatement>();
    //while label name
    private String labelName;


    public String getLabelName() {
        return labelName;
    }

    public void setLabelName(String labelName) {
        this.labelName = labelName;
    }

    public void accept0(SQLASTVisitor visitor) {
        if (visitor.visit(this)) {
            acceptChild(visitor, condition);
            acceptChild(visitor, statements);
        }
        visitor.endVisit(this);
    }

    @Override
    public List<SQLObject> getChildren() {
        List<SQLObject> children = new ArrayList<SQLObject>();
        children.add(condition);
        children.addAll(this.statements);
        return children;
    }

    public List<SQLStatement> getStatements() {
        return statements;
    }

    public void setStatements(List<SQLStatement> statements) {
        this.statements = statements;
    }

    public SQLExpr getCondition() {
        return condition;
    }

    public void setCondition(SQLExpr x) {
        if (x != null) {
            x.setParent(this);
        }

        this.condition = x;
    }

    public SQLWhileStatement clone() {
        SQLWhileStatement x = new SQLWhileStatement();

        if (condition != null) {
            x.setCondition(condition.clone());
        }
        for (SQLStatement stmt : statements) {
            SQLStatement stmt2 = stmt.clone();
            stmt2.setParent(x);
            x.statements.add(stmt2);
        }
        x.labelName = labelName;
        return x;
    }

    @Override
    public boolean replace(SQLExpr expr, SQLExpr target) {
        if (condition == expr) {
            setCondition(target);
            return true;
        }

        return false;
    }
}
